MATLAB: How to plot a surface in its parametric form

3d plotsparametersparametric equationplottingsurface

Hello,
I have à problem when I try to plot a surface that has this form for exemple:
 0=<r=<infinite
 0=<t=<2*pi
x=r*cos (t)
y=r*sin (t)
z=(r^3)/6
This is the surface il want to plot but the value in z bother me. Indeed I can't use meshgrid because of that.
What can I do?
Thanks for your help !

Best Answer

clc; clear all ;
M = 100 ; N = 100 ;
rinf = 100 ; % take rinf how big you want 
r = linspace(0,rinf,M) ; 
t = linspace(0,2*pi,N) ; 
[R T] = meshgrid(r,t) ;
X = R.*cos(T) ;
Y = R.*sin(T) ;
Z = R.^3/6 ;
surf(X,Y,Z) ;
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